What will happen when a read-write SSD cache degrades?

Details

DSM Unified Controller provides an automatic protection mechanism for degraded SSD cache to save users the hassle of performing additional operations.

Resolution

When a read-write cache under RAID 1 / RAID 5 / RAID 6 / RAID 10 degrades, the Automatic protection mechanism will activate. It will stop caching new I/Os and start writing (i.e., synchronizing) existing data from the SSD cache to HDDs. During this process, all services on the volume will continue as normal.

New data will not be written into the degraded SSD cache during this time but will be written directly into the HDDs. When data synchronization completes, all services will function without any risk of data loss, even if a second SSD degrades.

To repair an SSD cache, please refer to this article for further information.

Further reading

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